That's really it, depending on how you want to wire it up. If you want to do it like I did it, which retains the stock wiring harness completely, you'll need two red (preferably) spade fork wire connectors. They look like this:

To prepare them use clippers and cut off one of the tines of each "fork," or use pliers to bend one tine back and forth until it breaks off.

HOW TO DO IT:

The stock horn is located on the passenger side, attached by a bolt to the part of the chassis that covers the strut. Here's a picture of the stock location, followed by a close up:

As you can see, it's a small horn. I made an audio clip of the stock horn. You've heard it, so there's no point in listening to it, but it's here for comparison sake anyway:

With my iPhone placed on the engine cover, using an application that measures sound in decibels, the stock horn alarm put out about 92db.

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Ok, so look at the stock horn closely, and you'll see it's only connected by 1 10mm bolt. Remove the bolt, disconnect the horn from its harness, and remove it from the car.

Now, you'll want to prepare the horn itself. You only need a few inches of wire, though it comes with several feet. I think I used about 8 inches, but give yourself as much as you need. You can always cut it shorter after you test fit it, but you'll have a hard time cutting it longer.

Once you determine how much wire you need, cut away the excess, and strip the ends of the two remaining wires (red and black.)

At this point, if you purchase the siren I linked, you'll need to decide whether or not to cut the black loop wire. If you don't, when the car "chirps" it does so with a reduced volume. If you cut the wire, it will not reduce the volume when it chirps. I think it's more "polite" to have a softer chirp, so I did not cut my wire.

Whatever you decide, now cover the entire wire, red, black, and black loop with a piece of tubular shrink wrap (if you have it) and heat it up. (Otherwise, use electrical tape, zip ties, or whatever you'd like to use to make it look like you want it to look.) Now, crimp one one-tined fork spade connector onto each wire. It now should look like this:

Next, mount the bracket of the siren through one hole of the bracket into the same location the stock 10mm bolt came from, using the same bolt, and tighten it up. You can orient it however you like, there's plenty of room. However, it's probably best to orient it with the siren down to keep it from collecting dust, water, bugs, or whatever else you might run into in your environment.

Now, push the tine into the stock horn harness, one in each side. Evidently, you do have to have the positive and negative in the correct slots. However, if you get it wrong, it won't break anything -- it just won't work. So if you put them in one way, and it doesn't work, swap them. It should be a snug fit. Use electrical tape to make the connection secure and waterproof. Finally, push the connector down and zip tie it to the factory wiring look immediately below it. (You can't miss it.)

The new alarm registers 98db on the same app on the same phone in the same location as the stock horn. Every 3db is supposed to sound twice as loud to the human ear, so technically, this should sound 4 times as loud as the stock horn. To my ear, it's not quite *that* loud, but it definitely louder.

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So there you have it. A 15 minute, $15 mod that ANYONE can do. And I think it adds a touch of class to the Optima.

Registered

^^^^this..(i usually wait until no ones around to lock my car) lol.. the horns just so puny :/ ..i purchased a set of sick speed horns a while back and they sounded just as crappy,.. def going to look into getting this. Great write up by the way! @RevDoc :thumbup:

If it's the one I got, it's only programmable in that you can make the chirp louder by cutting the wire. There's a note on it that specifically says, "None of the six siren tones can be disabled." I think if it was hooked up to constant power, it might change tones 6 times before going back to the original. I'm not sure the car provides constant power to it though. Does that make sense?

Registered

If it's the one I got, it's only programmable in that you can make the chirp louder by cutting the wire. There's a note on it that specifically says, "None of the six siren tones can be disabled." I think if it was hooked up to constant power, it might change tones 6 times before going back to the original. I'm not sure the car provides constant power to it though. Does that make sense?

Actually, if you press the panic button, the horn will go off whether the hood is open or closed (or the button is pressed). But you're right, if you want to hear it chirp with the hood up, you do have to press that button.

Registered

Actually, if you press the panic button, the horn will go off whether the hood is open or closed (or the button is pressed). But you're right, if you want to hear it chirp with the hood up, you do have to press that button.
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Correct, forgot to mention that as I tried both when I had the wires backwards & nothing even with the button depressed... Also my webserver appears to be down at the moment so pic is not showing up...

Also my EX factory horn sat further forward due to the bracket being different than urs, but that doesnt really matter now... I did drill the hole out to 1/4" on the new Siren to make the bolt fit but also cause I had a tighter space to work with due to my nameless FSTB, was easier to drill it out a tad than try to crank on the bolt...

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sorry if this has been posted or not, but when i installed my audio (adding subs and amps) i made a thorough research but cant find any, i spent at least 2 hours doing research while my project still on halt...i was having trouble looking for "remote signal" to activate the amp..some says...

Let me start by saying this : This is NOT an easy install. If you're not comfortable doing wiring work, do not attempt this install.
Professional Installation is STRONGLY Recommended!
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Hi all,
I install my new headlight with DRL eyeline on my EX 2015 but my problem is that the eyeline is kinda on dim all the time and at all the position. Also during the day my high beam is on as the DRL and the eyeline like I mention is dim. My question is: is it possible to turn off the high...